Rainbow-electronics MAX1715 User Manual download pdf

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX1715 PWM controller provides the high effi-

ciency, excellent transient response, and high DC out-

put accuracy needed for stepping down high-voltage

batteries to generate low-voltage CPU core, I/O, and

chipset RAM supplies in notebook computers.

Maxim’s proprietary Quick-PWM™ quick-response,

constant-on-time PWM control scheme handles wide

input/output voltage ratios with ease and provides

100ns “instant-on” response to load transients while

maintaining a relatively constant switching frequency.

The MAX1715 achieves high efficiency at a reduced

cost by eliminating the current-sense resistor found in

traditional current-mode PWMs. Efficiency is further

enhanced by its ability to drive very large synchronous-

rectifier MOSFETs.

Single-stage buck conversion allows this device to

directly step down high-voltage batteries for the highest

possible efficiency. Alternatively, two-stage conversion

(stepping down the +5V system supply instead of the

battery) at a higher switching frequency allows the mini-

mum possible physical size.

The MAX1715 is intended for CPU core, chipset,

DRAM, or other low-voltage supplies as low as 1V. The

MAX1715 is available in a 28-pin QSOP package. For

applications requiring VID compliance or DAC control

of output voltage, refer to the MAX1710/MAX1711 data

sheet. For a single-output version, refer to the MAX1714

data sheet.

Applications

Notebook Computers

CPU Core Supply

Chipset/RAM Supply as Low as 1V

1.8V and 2.5V I/O Supply

Features

♦ Ultra-High Efficiency

♦ No Current-Sense Resistor (lossless I

LIMIT

)

♦ Quick-PWM with 100ns Load-Step Response

♦ 1% V

OUT

Accuracy over Line and Load

♦ Dual-Mode Fixed 1.8V/3.3V/Adj or 2.5V/Adj Outputs

♦ Adjustable 1V to 5.5V Output Range

♦ 2V to 28V Battery Input Range

♦ 200/300/420/540kHz Nominal Switching Frequency

♦ Over/Undervoltage Protection

♦ 1.7ms Digital Soft-Start

♦ Drives Large Synchronous-Rectifier FETs

♦ Power-Good Indicator

MAX1715

Ultra-High Efficiency, Dual Step-Down

Controller for Notebook Computers

________________________________________________________________ Maxim Integrated Products 1

19-1541; Rev 1; 5/00

Pin Configuration appears at end of data sheet.

Quick-PWM is a trademark of Maxim Integrated Products.

-40°C to +85°C

PART

MAX1715EEI

TEMP. RANGE PIN-PACKAGE

28 QSOP

Ordering Information

EVALUATION KIT

AVAILABLE

OUTPUT1

1.8V

BATTERY

4.5V TO 28V

ILIM1

ON2

DL1

TON

OUT1

LX1

DH1

FB1 AGND

BST1

ILIM2

ON1

REF

DL2

PGND

OUT2

LX2

DH2

FB2

V+

BST2

SKIP

5V INPUT

PGOOD

OUTPUT2

2.5V

MAX1715

Minimal Operating Circuit

1 2 3 4 5 6 ... 24 25

Summary of Contents

Page 1 - Minimal Operating Circuit

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,or visit Maxim’s website at www.maxim-ic.com.General Des

Page 2 - ELECTRICAL CHARACTERISTICS

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers10 ______________________________________________________________________

Page 3

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 4

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers12 ______________________________________________________________________

Page 5 - MAX1715-03

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 6 - EFFICIENCY (%)

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers14 ______________________________________________________________________

Page 7

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 8 - Pin Description

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers16 ______________________________________________________________________

Page 9 - Pin Description (continued)

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 10 - +5V Bias Supply (V

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers18 ______________________________________________________________________

Page 11 - Table 2. Component Suppliers

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 12 - On-Time One-Shot (TON)

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers2 _______________________________________________________________________

Page 13

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers20 ______________________________________________________________________

Page 14 - OUT DROP

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 15 - Current-Limit Circuit (ILIM)

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers22 ______________________________________________________________________

Page 16 - Power-Good Output (PGOOD)

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 17 - No-Fault Test Mode

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers24 ______________________________________________________________________

Page 18 - Output Capacitor Selection

Ultra-High Efficiency, Dual Step-DownController for Notebook ComputersMAX1715Maxim cannot assume responsibility for use of any circuitry other than ci

Page 19 - MOSFET Power Dissipation

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 20 - Dropout Performance

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers4 _______________________________________________________________________

Page 21 - CPU Buck Regulator

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

Page 22 - PC Board Layout Guidelines

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers6 _______________________________________________________________________

Page 23 - Layout Procedure

300200250150100500-400-2040206080MAX1715-12TEMPERATURE (°C)FREQUENCY (kHz)FREQUENCY vs. TEMPERATURE(2.5V, 4A COMPONENTS, SKIP = HIGH)CABMAX1715-16A =

Page 24 - Pin Configuration

170 MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers8 ___________________________________________________________________

Page 25 - Package Information

MAX1715Ultra-High Efficiency, Dual Step-DownController for Notebook Computers_________________________________________________________________________

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